.btn{
    display: inline-block;
    @include button-size($btn-padding-y, $btn-padding-x,
        $btn-font-size, $border-radius);
    white-space: nowrap;
    text-align: center;
    margin: 0 $spacer/2;
    font-weight: $btn-font-weight;
    line-height: $btn-line-height;
    color: $body-color;
    background-color: $body-bg;
    border: $btn-border-width solid transparent;
    box-shadow: $btn-box-shadow;
    cursor: pointer;
    transition: $btn-transition;
    &.disabled, &[disabled]{
        cursor: not-allowed;
        opacity: $btn-disabled-opacity;
        > * {
            pointer-events: none;
        }
    }
}

.btn-lg{
    @include button-size($btn-padding-y-lg, $btn-padding-x-lg,
        $btn-font-size-lg, $border-radius-lg);
}

.btn-sm{
    @include button-size($btn-padding-y-sm, $btn-padding-x-sm,
        $btn-font-size-sm, $border-radius-sm);
}

.btn-primary{
    @include button-color($primary, $primary, $white);
}

.btn-danger{
    @include button-color($danger, $danger, $white);
}

.btn-default{
    @include button-color($white, $gray-400, $body-color,
        $white, $primary, $primary);
}

.btn-link {
    font-weight: $font-weight-normal;
    color: $btn-link-color;
    text-decoration: $link-decoration;
    box-shadow: none;
    &:hover{
        color: $btn-link-hover-color;
        text-decoration: $link-hover-decoration;
    }
    &:focus, &.focus{
        color: $btn-link-hover-color;
        text-decoration: $link-hover-decoration;
    }
    &[disabled], &.disabled{
        color: $btn-link-disabled-color;
        pointer-events: none;
    }
}